Electric generator for ignition systems.



. I E. POIJLEAKL ELECTRIC GENERATOR FOR IGNITION SYSTEMS. APPLIOATIQN FILED JUNE I0, 1911'.

1,098,753. I Patented June 2, 1914,

2 sums-slum 1.

WITN SE5: [NI ENTOR A liar/1e Ignition Systems,

UNITE STATES PATENT OFFICE. I

EMIL ronLnsAie, or rirrnv, OHIO.

ELECTRIC GENERATOR non. reunion SYSTEMS.

Be it known that -I, EMTL PODIlEQ'Ui, a citizen of the United States, residing at Tiifin, in the county of Seneca and State of Ohio, have invented certain new and useful Improvements in Electric Generators for of which the following is I To all when; it may-concern a s ecification. i

his invention relates to a current genera:

tor of the magneto typefor usein ignition systems for internal combustion engines.

The invention has for one of its objects to improve the construction of dynamo electric -machines of this type so that reliable and efficient ignition can be obtained and at the same time a simple, compact and strong structure produced wherein the magnetic field is of such a character that not only will 7 the current 'be effective for producing ignition' while the magneto is driven at regular speed by the engine,-b'ut also when starting or cranking the engine,

so that in actual practice batteries can be dispensed-with for generating the starting current. I Another object of the invention is to improve the mechanical design of the field structure so that the individual parts can be manufactured and assembled'at a minimum and in which large cost. Another object is to. provide amacliine in which the armature is thoroughly mcased so as to be strictly'oil, dust. and waterproof,

bearings for the armature shaft are provided and excessive wear ofthe bear-ingsis reduced toa minimum by efiectivelubrication and because of the comparative low speed of rotation of the arma parts hereinafter and set forthwithparticularity 5. 2is a vertical ture, the effective speed being between 1,200 and 1,500 B. P. M., as compared with 2,000 to 3,000 R. P. M. of other machines of the same type,

W'ith these Objects in view. and others, as will appear as the description proceeds, the

various novel feawhich will be more fully described in the claims appended hereto. I

In the accompanying drawings, is a perspective view of the machine. Fig.

section thereof taken transversely to thearmature. Fig. 3 is a front view of a horizontal type of machine wherea in the magnets are horizontal instead of be- Fig. 1.

ing vertical, as in the vertical type shown in Fig. 4 is a perspective view of one Specification of Letters Patent. Application filed June 10, 1911. Serial No. 632,377.

' Fig. 8 is a perspective view the pole pieces Figure 1 flange 10 which Patented June 2, 1914.

of the pole pieces. Fig. 5 is a perspective view of the upper ends of one group of permanent bar magnets. view of one of the clips for clamping the bar magnets to the pole pieces. spective view of the rear shaft bearing. of one of the plates that cooperate with the pole pieces and bearings for iiicasing the armature. Fig. 9 is an inner perspective view of the clip shown in Fi g. 6. Fig. 10 is a sectional view throughone group of magnets and ad- Jacent pole piece, showing the manner of fastening the said parts together by the shown in Figs. 6 and 9. Fig. 11 is a per- Fig. 7 is a perclip Fig. 6 is a perspective spective view of one of the spacing springs i between juxtaposed magnets.

Similar reference characters are employed to designate corresponding parts throughout the views.

Referring to the drawings, A designates the pole pieces of the field structure, and B, the magnets thereof which are clamped to to form the complete magnetic field. The pole pieces are rigidly fastened together by the/front and rear bear ings C and D in which rotates the shaft 1 of the armature type and of any approved construction.

E which is of the commutator The pole pieces in Figs. 1 and-Qare substantially the same except that the bottom through pole piece has feet extensions 2 which bolts can be passed for fastening tli machine to. a supporting base. Each po 0 piece consists of a castingof magnetic material and is iii 3 which has outwardly-extending flanges or projections 4: extending parallel .to each other and having their outer faces of stepped formation, at 5, for receiving the ends of the magnets. The arms or projections i constitute with the body 3 a U-shaped structure, the holl'ow'side of which is external with restreet to the frame or field of the machine. The concaved surface 6 of each pole piece is concentric with the armature E and is sep- 'arated therefrom by a minimum clearance.

The end faces 7 of the pole pieces are plain or flat so that the bearings can be snugly fitted thereto, a-ndthe 'side edges 8 of the pole pieces are also flat or straight in orderthat the closure plates 9 can be fitted therethe form of an arcuate body to to completewith the pole pieces and bearing the housing or casing for the armature. Entirely around the pole piece is a bead or overhangs the oints between the pole pieces and bearings at the ends and between the polepieces and plates 9 at the sides, so that a comparatively water,

dust and oil tight casing is obtained.

The bearings C and D are formed with flat -plate'like base portions 11 that lit against the endfaces 7 of the pole pieces,

and the base" portions 11 of the bearings ass bolts openings 14 in-the pole pieces. The front -bearing C, particularly, is chambered so as to receive the commutator bf an armature,

and at opposite sides of the hearing are fastened brush holders F which form no part of" the-present invention, and hence need not be specifically described, the brush holdershaving binding posts or terminals 15 by WhlCll the wires of the ignition circuit are 5 I connected with the magneto. Eachbearing has an oil cup 16 of the wick type for lubricating the shaft. The plates 9 are preferably of brass and of such length as to extendfrom the front to the rear bearing tions 11 of the bearings.

and of such width as to extend from one pole piece .to the other, the ends of the plates 9 overlapping the side edges of the base por- Each plate 9, as shown in 'F ig. 8, has central openings adjacent? its upper and lower edges, through which pass screws 17, Fig. 2, that are threaded'ilitapped openings 18 in the pole pieces. The plates 9are slightly bowed outwardly at the center so that when the screws 17 are drawn home, the plates will be straightened out and held under tension against the pole pieces and bearings so that rattling will not occur with only two screws securing the plates in place.

Each group of magnets B consists of a plurality of sets'of magnetic bars, such as tungsten'steel, the bars 19 and 20 of eachset being of different lengths. Although only two bars areshown in each set, it is obvious that any other number may be employed. The shorter bars 19 are innermost and the ends bear on the surfaces or steps 21 while the longer bars 20 bear on the surfaces or steps 22 of the pole pieces. On the step 21 is an ear or lug 23 that serves to space the sets of bar magnets from each other. Between the bars of each set are bowed spacing springs 2-1 which are placed under compression when the fastening clips 25 are secured to the ends of the magnets, These clips, as shown in Figs. 6 and 9, are preferably made of sheet metal punched and stamped so as to consist, of afiat body portion 26, end flanges or lugs 27, and an edge flange 28, all of which flanges are at ap proximate right angles to the body portion 26.' These clips are applied to the ends of 28 extend over thdends of the longer magnets. Each clip is held in place by a single screw 29 that passes through a central opening 30 in the clip and screws into a tapped opening 31 in the center of each step 22 of the pole pieces.- In other words, the screws 29 pass between the two sets of magnets at each side of the machine, so that the magnets will not have to be bored. As .the screws are driven home, the bowed spacing springs 24 are placed under compression, so that the vibration of the machine will not produce rattling or other noise, as would be the case without the bowed springs or'other equivalents.

In the horizontal type of machine shown in Fig. 3, the magnets are clamped to the pole pieces by through bolts 32, which are ofsuch length as to extend entirely across the pole pieces through the clips and intoa base plate 33 so that the bolts 32 secure the machine as a unit to a base plate and fasten the magnets in place.

By the peculiar construction of the pole pieces, it is possible to obtain'a'large output of current, especially for starting the engine, so that a battery can be dispensed with.

shape of the magnetic paths, as apparently the extra large area of leakage-surfaces at the sides of the pole pieces enables the armature to become rapidly denergized when the circuit is broken after each ignition spark.

From the foregoing description, taken in connection with Q19. accompanying drawings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains, and while I have described the principle of operation of the invention, together with the apparatus which I now consider to be the best embodiment thereof, I desire to have it understood that the apparatns shown is merely illustrative, and that such changes may be made when desired as are within the scope of the claims appended hereto.

Having thus described the invention, what I claim as new, is

l. A generator comprising an armature, 11g pole pieces having stepped surfaces, sets of long and short permanent magnets bearing: on the steps of said surfaces, clamping means applied to the ends of the magnets, fastenings extending through said means and be- 1m tween the sets of magnets and secured to the pole pieces, and compressible means between the magnets.

2. A generator comprising a rotor, oppositely-disposed arcuate pole pieces each having-fianges extending outwardly from the outer face of the pole piece adjacent the sides thereof, the outer faces of the flanges being stepped, lugs on the stepped faces of the flanges, sets of magnets of difi'erent 13g lengthsclamped to the stepped faces of the flanges and separated from each other by the said lugs, clips applied'to the ends of the magnets, and fastenings passing through the clips and between the sets of'magnets and connecting with the pole pieces.

3. A fieldstructure for a generator comprising a polepiece having extensions provided with flat surfaces, permanent bar magnets bearing on the flat surfaces, said bars being arranged in sets, yielding elements between the magnets of each set, andmeans for clamping the magnetsto the pole pieces and placing the elements under tension. 4. A field; structure-for a generator-ineluding a pole piece, a plurality ofmagnets bearing 'onthe pole piece, a bowed spring interposed between'the magnets, a clip embracing the ends of the magnets and holding the same, and a fastening for securing the clip to the pole piece andholding the said spring under tension.

5'; A field structui'e for a generator including a pole piece, a plurality of sets of bar magnets bearing on the pole piece, bowed springs betweenthe magnets of each set, a single clip embracing the ends of the sets of magnets, and means for securing the clip to the pole piece and holding the springs under tens1on..

6. A field structure for a generator including a pole piece having a. stepped surface, a plurality of sets of magnets having their ends bearing on the stepped surface, faclip extendin over the endsof the magnets and havinganges for engaging the sides and ends of. thema'gnets of all the sets, and

a fastening passing through the clip and 40' between the sets of magnets for securing the latter to the pole piece.

7-. A field structure including a pole piece having a'step ed surface, a lug on one of the steps of t e said surface, a set of long and short magnets at opposite sides of the lug and bearing"- on the steps of .the said surface, a clip applied to the ends of themagnets, a fastenm extending through the clip and between he sets of magnets and connected with the pole iece, and compr;'-.5 sible elements between t e magnets of each set. i

'8. A pole piece comprising an arcuate body havin approximately radial flanges formed wit 1 stepped .outer surfaces, the-f stepped magnet bearing surface of one flange being parallel with that of the other flange, said body having straight end and side surfaces, and a water-shedding flange on the pole piece projecting from the end and side surfaces.

9. A generator comprising a rotor, oppositely disposed pole pieces, bearings secured to the pole pieces, plates secured to the sides of the pole pieces to coiiperate with the latter and bearings to form a closed housing for therotor, and sets of bar magnets sccured to the pole pieces disposed at opposite sides of and arranged with their middle ortions nearest to the rotor and having t eir ex remities bearing on the pole pieces.

0. A generator comprising an armature, oppositely disposed pole pieces, bearings securing the pole pieces together and rotatably supporting e armature lates closing the space between the pole i eces and between the bearings, means 'for'fastening the plates to the pole'pieces, flanges on the pole pieces overhanging the edges of the bearings and plates, and magnets connecting the pole pieces.

11L A-generatorcom rising an armature, oppositely-disposed po e pieces having flat end and side surfaces, bearings-fastened to the end surfaces for securing the pole pieces "together and rotatably supporting the armature, plates bearing on the side surfaces and bridging the gaps between the pole pieces and cooperating with the bearings and pole pieces to form a.cl0sed chamber for the armature, bar magnets extending from one pole piece to the other and disposed with ture, plates bearing on t e side surfaces of the pole pieces and cooperating with the bearings and pole pieces to form a closed chamber for the armature, .the said plates having a tendency to bow outwardly at their middle port1ons,1and fastenings se- "curin .the plates to the pole pieces and holding t em flat against thelatter' and against the bearings.

In testimony whereof I aflix my signatur in presence of two witnesses.

EMIL PODLESAK- Witnesses:

' JENNIE H; Freon, H. W. MIcHAELs.

- opies of this patent may be obtained for five cents each, by addressing the f Commissioner of latents,

' Washington, G. i 

